package utils;

import android.annotation.SuppressLint;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import javax.crypto.spec.IvParameterSpec;


public class Des {
    private byte[] desKey;


    //解密数据
    public static String decrypt(String message,String key) throws Exception {

        byte[] bytesrc =convertHexString(message);
        Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
        DESKeySpec desKeySpec = new DESKeySpec(key.getBytes("UTF-8"));
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
        SecretKey secretKey = keyFactory.generateSecret(desKeySpec);
        IvParameterSpec iv = new IvParameterSpec(key.getBytes("UTF-8"));

        cipher.init(Cipher.DECRYPT_MODE, secretKey, iv);

        byte[] retByte = cipher.doFinal(bytesrc);
        return new String(retByte);
    }

    public static byte[] encrypt(String message, String key)
            throws Exception {
        Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");

        DESKeySpec desKeySpec = new DESKeySpec(key.getBytes("UTF-8"));

        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
        SecretKey secretKey = keyFactory.generateSecret(desKeySpec);
        IvParameterSpec iv = new IvParameterSpec(key.getBytes("UTF-8"));
        cipher.init(Cipher.ENCRYPT_MODE, secretKey, iv);

        return cipher.doFinal(message.getBytes("UTF-8"));
    }

    public static byte[] convertHexString(String ss)
    {
        return HexUtil.StringToBytes(ss);
    }


    @SuppressLint("DefaultLocale")
    public static void main(String[] args) throws Exception {
        String key = "12345678";
        String value="test1234";
        String jiami=java.net.URLEncoder.encode(value, "utf-8").toLowerCase();

        System.out.println("加密数据:"+jiami);
        String a=toHexString(encrypt(jiami, key)).toUpperCase();


        System.out.println("加密后的数据为:"+a);
        String b=java.net.URLDecoder.decode(decrypt(a,key), "utf-8") ;
        System.out.println("解密后的数据:"+b);

    }


    public static String toHexString(byte[]b) {

        return  HexUtil.HexToString(b);

    }

}
